The pump unit is used to supply the sprinkler system with water at high pressure. The Ultra Fog pump unit is built on a water tank and consists besides this of two high pressure pumps driven by electrical motors. There are also filters and a high pressure manifold with pressure sensors and a flow sensor. Normally the electrical cabinet containing all electronics is mounted on the pump unit to make the installation easier.
Besides the ordinary pump unit there is an extension unit. It is built up by a water tank and two high pressure pumps with electrical motors. This unit is connected to the ordinary pump unit to increase the pump capacity for larger systems. If needed more extension pump units can be added.
The pump unit is activated by external sensors or detectors or by the internal flow sensor. When the pump unit is activated the fire alarm will start as well as the first high pressure pump. If a single pump can’t provide enough water for the system at the correct pressure the next pump will start. The pilot pressure is created by an air driven pump to increase the length of life and reliability.
The internal water tank guarantees that the high pressure pumps are always supplied with water. If the water level in the tank is to low the pumps will automatically stop. The water tank is supplied with water from a larger fresh water tank and the incoming water is filtered through a 25 μm filter. At sea seawater can be used as a backup for the system if the level in the fresh water tank would be too low.
For local protection of machinery a special pump unit is often used. This unit only has one high pressure pump since local protection systems require less water. Except for this the local protection pump unit is built in the same way as the standard pump unit.